DOC: typo in scipy/interpolate/_rgi.py
DOC: typo in scipy/interpolate/_rgi.py

Co-authored-by: Atsushi Sakai <7a3f88ec7e47da9d0f8b0a67680e7d161172975d@gmail.com>
Stefan-Endres/scipy,anntzer/scipy,WarrenWeckesser/scipy,ilayn/scipy,perimosocordiae/scipy,WarrenWeckesser/scipy,ilayn/scipy,andyfaff/scipy,scipy/scipy,mdhaber/scipy,endolith/scipy,Stefan-Endres/scipy,mdhaber/scipy,endolith/scipy,ilayn/scipy,Stefan-Endres/scipy,andyfaff/scipy,perimosocordiae/scipy,scipy/scipy,perimosocordiae/scipy,scipy/scipy,ilayn/scipy,endolith/scipy,Stefan-Endres/scipy,perimosocordiae/scipy,WarrenWeckesser/scipy,Stefan-Endres/scipy,WarrenWeckesser/scipy,andyfaff/scipy,anntzer/scipy,perimosocordiae/scipy,anntzer/scipy,scipy/scipy,anntzer/scipy,perimosocordiae/scipy,rgommers/scipy,rgommers/scipy,andyfaff/scipy,rgommers/scipy,scipy/scipy,andyfaff/scipy,ilayn/scipy,mdhaber/scipy,WarrenWeckesser/scipy,anntzer/scipy,endolith/scipy,mdhaber/scipy,endolith/scipy,rgommers/scipy,rgommers/scipy,andyfaff/scipy,Stefan-Endres/scipy,scipy/scipy,WarrenWeckesser/scipy,mdhaber/scipy,anntzer/scipy,mdhaber/scipy,endolith/scipy,ilayn/scipy